Roll grinding device including chock positioning means

ABSTRACT

A roll grinding device for a roll supported by chocks, comprising a plurality of vertically movable pins for supporting the chocks, each pin having a slope at its lower end, and a plurality of horizontally movable wedge members, each having a slope at its upper end adapted to be mated with the slope of a pin, for controlling the vertical positions of the pins. An assembly is provided for moving the wedge members horizontally, and the moving force is limited to a value less than that which can lift the total weight of the roll and the chocks at the supporting pins. An assembly is also provided for engaging the peripheral face of the roll near the chocks and for moving the roll from a non-grinding to a fixed grinding position in the chocks.

lj'nited States Patent Sakai ROLL GRINDING DEVICE INCLUDING CHOCKPOSITIONING MEANS Related U.S. Application Data Continuation-in-part ofSer. No. 202,770, Nov. 29, 1971, abandoned.

Inventor:

Assignee:

U.S. Cl 51/236; 51/254 Int. Cl B24b 41/06 Field of Search 51/49, 103 R,103 C, 236,

References Cited UNITED STATES PATENTS 2/1946 Case 51/49 11/1954 Mader51/238 S X 5/1963 Hold 51/49 X [451 July 29, 1975 3,691,701 9/1972 Clark51/238 S Primary ExaminerAl Lawrence Smith Assistant Examiner-NicholasI. Godici Attorney, Agent, or FirmSughrue, Rothwell, Mion, Zinn &Macpeak [57] ABSTRACT A roll grinding device for a roll supported bychocks, comprising a plurality of vertically movable pins for supportingthe chocks, each pin having a slope at its lower end, and a plurality ofhorizontally movable wedge members, each having a slope at its upper endadapted to be mated with the slope of a pin, for controlling thevertical positions of the pins. An assembly is provided for moving thewedge members horizontally, and the moving force is limited to a valueless than that which can lift the total weight of the roll and thechocks at the supporting pins. An assembly. is also provided forengaging the peripheral face of the roll near the chocks and for movingthe roll from a nongrinding to a fixed grinding position in the chocks.

4 Claims, 5 Drawing Figures PATENTEU 3,896,594

1 ROLL GRINDING DEVICE INCLUDING CI-IOCK POSITIONING MEANS REFERENCE TORELATED APPLICATION This application is a continuation-in-part of mycopending application Ser. No. 202,770, filed Nov. 29, 1971, nowabandoned.

BACKGROUND OF THE INVENTION The present invention relates to a rollgrinder,and, in particular, to a roll grinding device adapted to beattached to such a roll grinder without removing its bearings and chocksto fix the bearings and chocks in their proper positions, to therebyprovide a support for the roll, whereby the roll which is used inrolling or other operations can be re-ground.

Heretofore, since such rolls have been generally supported by bearingsat opposite ends of their bodies, when such a roll was to be re-groundit has been necessary to first remove the chocks which receive thebearings and then to support the roll by a cradle of the roll grinder atthe journal portions thereof.

However, the mounting and removing of the chocks for every re-grindingof the roll requires considerable time and labor, and it is possible todamage the bearings and the fixing means.

SUMMARY OF THE INVENTION An object of the present invention is toprovide a grinding device which can be mounted on a roll grinder withoutremoving its bearings and chocks, and by which an excellent re-grindingis possible without using any special or complicated machinery.

The present invention is directed to a roll grinding device for a rollgrinder, which comprises, characterizingly, a plurality of pins forsupporting chocks, each having a slope at its lower end; a pluraliity ofwedges, each having a slope adapted to be mated with the slope of a pin,for determining the vertical position of said pin; means such as fluidpiston and cylinder units for moving the wedges in the horizontaldirection and for limiting the moving force of said wedges such that itis less than the force which causes a lifting of the total weight of theroll and the chocks at the position of the pins; and shoes adapted tourge the peripheral face of the roll near the chocks to a grinding sidefor fixing the position of the roll in the chocks.

BRIEF DESCRIPTION OF THE DRAWINGS Other objects and features of thepresent invention will become apparent from the following description ofa preferred embodiment of the present invention shown in the attacheddrawings, in which:

FIG. 1 is a schematic plan view of an embodiment of the apparatus of thepresent invention when a roll is mounted;

T FIG. 2 is a side elevational view of a cradle having LII bearing 17and the outside of the support spindle 19 is greatly exaggerated forpurposes of illustration.

DESCRIPTION OF THE PREFERRED EMBODIMENT A roll 15 having supportspindles I9 at either end thereof is initially provided with a drivingdog 1 rotated by any suitable means as, for example. an electric motor.The roll 15 is then mounted on a grinder. Then, as shown in FIG. 1, acenter 14 of a loose tail stock 2 is advanced and, together with acenter of a head-stock 3, supports the roll 15 as well as centers thesame, The grinding wheel may translate with respect to the roll or viceversa, but conventionally, and as shown, the grinding wheel translatesreciprocally with respect to the roll. The relative motion of the twomay be secured by any conventional means as, for instance, a racksecured to the frame, a spiral gear mounted on the housing containingthe grinding wheel, a suitable motor contained in the housing to drivethe spiral gear. and means for reversing the direction the spiral gearis driven at either end of the grinding wheels traverse.

In this case, beneath two chocks 16, a cradle 4 is provided, a slightgap d being provided between the chocks 16 and the cradle 4 (See FIG.2). Further, a plurality of supporting pins 5, e.g., four, are providedon the upper face of the cradle 4, and all of the supporting pins 5 abutthe lower faces of the chocks 16 by means of an oil pressure operation,the supporting pins being stopped by appropriate control means atpositions where they bear the loads equally. This is necessary becausethe lower faces of the chocks 16 with which the supporting pins 5 areengaged are not completely flat. Accordingly, the supporting pins areprovided for eliminating troubles during the grinding operation, such asswinging due to unstability or setting which causes an undue amount ofwear on the bearings.

The operating mechanism of the supporting pins 5 is shown in FIGS. 3 and4. In FIG. 4, numeral 9 is a distributor valve, and the pump PF is apower source which forces pressurized fluid into conduits in order tomove the pistons 7 in the cylinders 6. When the supporting pins 5receive the lower portions of the chocks 16 and a push button actuatingthe pressure controlling means PC is depressed, a solenoid SOL. 1associated with valve 9 is energized to feed fluid under pressure intothe cylinders 6. For example, four cylinders 6 are provided so that fourpistons 7 in the cylinders are actuated to shift four wedges 8 laterallyor to the right as shown in FIG. 3, to thereby move the supporting pins5 upwardly.

When the pushing force derived from the oil pressure cylinders 6 issmaller than the total weight of the chocks 16 including at least roll15, the supporting pins 5 do not push the chocks 16 upwardly but it doeseliminate the gap between the pins 5 and the lower faces of the chocks16 (See FIG. 2). In this manner, the respective supporting pins 5 arestopped at the positions where the gap between the pins 5 and the lowerfaces of the chocks 16 is eliminated, i.e., when the upper faces of thepins 5 contact the lower faces of the chocks 16.

Since the wedges 8 are held in their positions, the supporting pins 5are not moved downwardly by the weight of the chocks l6 and the roll 15,even though the push button of the oil pressure operation is released,or the center 14 is retracted to separate it from centering operationandbefore the grindingoperation;

from slipping laterally and fallingdown. 7 Although, in this manner, itis possible to the roll IS'after the completion of the aforementioned wgardless of whether they are of the flat type'or of the rolling type.Accordingly, the, precision working of workpieces-such as acompletefcircle and circularcyl 'inder is very difficult. V P V Toalleviatezthis. problem; a stabilizing mechanism shownin FIG. 5 isprovided for stabilizing the support-. 7 ing positions at which the bodyof the roll ISfis received. The numer'al 13 represents shoes, andywhenthe body of the roll-15is engaged byithe shoes 13, the

roll 15 is'shifted in the horizontal direction by a certain amount 8because the center 0', of the support spindle 19 is lower, than thecenterfl of the bearing 17 by a half of the gap theresbetween. The shoes13are'mounted on the frame of the machine, as may be seeniinFlG. 5, anda the motion thereof requiredto' keep'them in'urging 17 and the,diameterpf the" suppam mdie l9,"and P r is the urging force of oneof'theshoes 13:"

1 contact with'the roll I5 may :be provided by meansrot a screw andmotor, fluidicylinders, or any other appropriate means, many ofwhicharelwllknown to the art I per se. Theshifted amountfi can becalculated from the following formula where W is the weightoftherollalS, Ee is the, difference between th'ediarneter of the bearingAccordingly,-if the urging force? of theshoesi3is as large as possiblewithoutscratching or flawing the roll 15, and the shift amount 5 in thehorizontal diirec tion is large, the body of the roll 15 is reduced bythe grinding operation, and the center position of the roll is changedwhile the amount 6 remains constant. Therefore, it is not necessary tomove the shoes while grinding, unless the reductionof the roll radiusreaches 8 and the urging force becomes substantially Zero.

In accordance with the present invention, if, as shown in FIG. 2, eitherthe distance X or y from the face recieving the checks 16 is constant,the centering operation of the center 14 can be eliminated by providingsheet'metal '10 of a predetermined th'icknesson the 5 upper face ofthecradlel po'sitioning the-Chocks '16 on. the sheet ,rnetalandathereafterIraisingithesupporting f j pins-5;'setting, forthefrontand backdirectiomthe ad-": justingEscrew .l lfprovided 'on the'brateus depending upon thefdistance" Xi, and tightenin'g'the screw'llsoI ithatitiisinfurging contactwithithefscrewilI.f' I 'Accordihg tothepresent'ifn ventiottntls'will Bearskin ,from the foregoing description,owing to thecombinw Q tion of a suitable numbferof supporting pins 5'forre ceiving the checks 16, which are moved vertically and, I held intheirpositions bythe wedges 8,"anditheshoes 13 for preventin g'the roll fromvibratingithe rolllS can,

besupported by 'thebe'aring portions 17 of the Chocks 16,.leavi'ng thechocksas theyare', and can be very eas j W ily reground under the. sameconditions as thosetmderg whieh'therollis used. Thus, the necessityofthemount-f ing and removingofthechocks l6 iseliminated There-Q fore, theworkingoperation can be'considerably Simpli- 'fied and the roll beingr'e'ground is'not subject to any vi "bration. r g f I I In particular,according to the present in ventio'n, y 2 since the'mechanicalconstruction isvery simple, it can i I be applied 'topthe conventionaluniversal 't'ype'roll j grinder withoutany modification. What is claimedis: i

,1. ;A u grinding. devi erforiai I an" suppmed y Y checks, said devicecornprisingz a pluralityof movable 1 supportingpinsforfsnpportingthechocks, saidpins having, sloped; lower, facefsty ahpltiralityof.;movablez a o wedgeshaying'sloped upperifaces adapted to mate with Ia the sloped'tacesoofisaid ttpportingpinsfo'rdetewhining]" the vjerticalpositions of saidlsupporting' pinsg meansfor" moving said wedges and.for'limiting' the moving force to a value less than 'that'which can liftthe total weight, of the roll and said checks at said supporting pins;and" I j means for engaging the-peripheralfaceof the roll near;

said checks. andfor urging the rollitoa grinding posi i tion, therebyfixing the 'po sition of the roll withinlthe l chocks. V 7 V 2. The rollgrinding device of claim 1 "wherein said means for moving said wedgescomprises a fluid actuated piston and cylinder unit.

3. The roll grinding device of claim 1 wherein said wedges are movablein a substantially horizontal direction, and said pins are movable in asubstantially vertical direction.

4. The roll grinding device of claim 1 wherein said means for engagingand urging the roll comprises a plu-

1. A roll grinding device for a roll supported by chocks, said devicecomprising: a plurality of movable supporting pins for supporting thechocks, said pins having sloped lower faces, a plurality of movablewedges having sLoped upper faces adapted to mate with the sloped facesof said supporting pins for determining the vertical positions of saidsupporting pins, means for moving said wedges and for limiting themoving force to a value less than that which can lift the total weightof the roll and said chocks at said supporting pins, and means forengaging the peripheral face of the roll near said chocks and for urgingthe roll to a grinding position, thereby fixing the position of the rollwithin the chocks.
 2. The roll grinding device of claim 1 wherein saidmeans for moving said wedges comprises a fluid actuated piston andcylinder unit.
 3. The roll grinding device of claim 1 wherein saidwedges are movable in a substantially horizontal direction, and saidpins are movable in a substantially vertical direction.
 4. The rollgrinding device of claim 1 wherein said means for engaging and urgingthe roll comprises a plurality of shoes.